Komatsu PC88MR-10 Shop Manual page 262

10 Structure and function
Electrical control system
Overheat prevention function
a For the system circuit diagram, see "Engine automatic warm-up function".
When the coolant temperature or the hydraulic oil temperature increases too high during operation, the
pump load is reduced and the engine speed is lowered to prevent overheat and protect the engine and
hydraulic components.
Operating condition
Working mode: P, ATT/P, ATT/E
Coolant temperature: Min. 95ºC
or
Hydraulic oil temperature: Min.
95ºC
Travel judgment: OFF
Operating condition
Working mode: P, ATT/P, ATT/E
Coolant temperature: Min. 98ºC
or
Hydraulic oil temperature: Min.
98ºC
Travel judgment: ON
Operating condition
Working mode: P, ATT/P, ATT/E
Coolant temperature: Min.
100ºC
or
Hydraulic oil temperature: Min.
100ºC
Travel judgment: Any position
10-184
(PC88MR-B717-042-K-00-A)
Operation and remedy
Engine speed: Kept as it is
Pump absorption torque is
lowered and engine load is
o
reduced according to the
torque control signal.
Operation and remedy
Engine speed: Kept as it is
Travel speed: Decreased
o
Operation and remedy
Engine speed: Kept as it is
Pump absorption torque is
lowered and engine load is
o
reduced according to the
torque control signal.
Condition for cancellation
Coolant temperature: Below
95ºC
Hydraulic oil temperature:
o
Below 95°C
When above condition is
satisfied, state before
operation is restored
(automatic restoration).
Condition for cancellation
Coolant temperature: Below
98ºC
Hydraulic oil temperature:
o
Below 98
When above condition is
satisfied, state before
operation is restored
(automatic restoration).
Condition for cancellation
Coolant temperature: Below
100ºC
Hydraulic oil temperature:
o
Below 100°C
When above condition is
satisfied, state before
operation is restored
(automatic restoration).
PC88MR-10